A Tutorial on Nonorthogonal Multiple Access for 5G and Beyond

Today's wireless networks allocate radio resources to users based on the orthogonal multiple access (OMA) principle. However, as the number of users increases, OMA based approaches may not meet the stringent emerging requirements including very high spectral efficiency, very low latency, and massive device connectivity. Nonorthogonal multiple access (NOMA) principle emerges as a solution to improve the spectral efficiency while allowing some degree of multiple access interference at receivers. In this tutorial style paper, we target providing a unified model for NOMA, including uplink and downlink transmissions, along with the extensions tomultiple inputmultiple output and cooperative communication scenarios. Through numerical examples, we compare the performances of OMA and NOMA networks. Implementation aspects and open issues are also detailed.Comment: 25 pages, 10 figure

An Experimental Study of NOMA for Connected Autonomous Vehicles

Connected autonomous vehicles (CAV) constitute an important application of future-oriented traffic management .A vehicular system dominated by fully autonomous vehicles requires a robust and efficient vehicle-to-everything (V2X) infrastructure that will provide sturdy connection of vehicles in both short and long distances for a large number of devices, requiring high spectral efficiency (SE). Power domain non-orthogonal multiple access (PD-NOMA) technique has the potential to provide the required high SE levels. In this paper, a vehicular PD-NOMA testbed is implemented using software defined radio (SDR) nodes. The main concerns and their corresponding solutions arising from the implementation are highlighted. The bit error rates(BER) of vehicles with different channel conditions are measured for mobile and stationary cases. The extent of the estimation errors on the success rate beyond the idealized theoretical analysis view is investigated and the approaches to alleviate these errors are discussed. Finally, our perspective on possible PD-NOMA based CAV deployment scenarios is presented in terms of performance constraints and expectancy along with the overlooked open issues.Comment: 7 Pages, 6 figure

Outage Performance of Dual Hop Full-Duplex MIMO Relay Networks with TAS/MRC over Rayleigh Fading Channels

13th International Symposium on Wireless Communication Systems (ISWCS) -- SEP 20-23, 2016 -- Poznan, POLANDWOS: 000386654000019In this paper, we investigate end-to-end (e2e) outage probability (OP) performance of dual hop full-duplex (FD) amplify-and-forward (AF) relay network with transmit antenna selection (TAS) and maximal-ratio combining (MRC) over independent identically distributed Rayleigh fading channels. In the network, source and destination are equipped with multiple antennas, and communicate with each other via a single relay, which is equipped with one receive and one transmit antennas. We assume that the direct link between the source and destination is not available. For signal transmission, TAS is used at the source by neglecting residual self-interference (RSI) effect and maximal-ratio combining (MRC) technique is employed at the destination for combining received signals. In order to simplify the theoretical derivations, we also investigate the e2e OP in case that the RSI is non-fading. OP expression is derived in integral form for the Rayleigh faded RSI effect. Moreover, in case of non-fading RSI effect, OP expression is derived in closed form. The analytical results are verified by the Monte Carlo simulations

Outage Probability of Full-Duplex MIMO Relay Networks with Co-channel Interference over Rayleigh Fading Channels

24th Signal Processing and Communication Application Conference (SIU) -- MAY 16-19, 2016 -- Zonguldak, TURKEYWOS: 000391250900272In this work, the outage probability of dual-hop full-duplex amplify-and-forward MIMO relay network is examined in the presence of co-channel interference at the relay over Rayleigh fading channels. The source and destination are equipped with multiple antennas and the relay is equipped with single receive and single transmit antennas. The effects of Rayleigh faded multiple co-channel interferences and self-interference between transmit/receive antennas of the relay are considered. In this relay network, transmit antenna selection at the source and maximal-ratio combining technique at the destination are employed. The outage probability of the relay network is examined via Monte Carlo simulations.IEEE, Bulent Ecevit Univ, Dept Elect & Elect Engn, Bulent Ecevit Univ, Dept Biomed Engn, Bulent Ecevit Univ, Dept Comp Eng

Performance of Joint Relay and Antenna Selection in the Full-Duplex Amplify-and-Forward Relay Networks

23nd Signal Processing and Communications Applications Conference (SIU) -- MAY 16-19, 2015 -- Inonu Univ, Malatya, TURKEYWOS: 000380500900144In this work, joint relay and antenna selection (JRAS) problem in Full-Duplex (FD) Amplify-and-Forward (AF) relaying network is examined. A dual-hop relay system with one source, one destination and N FD AF relays is considered. Each FD relay is equipped with N,. antennas for receiving and N, antennas for transmitting. In this FD relay system, joint selection strategy involves choosing the best single relay and the best single receive/transmit antenna at the source-to-relay/relay-to-destination links. The system model is developped and the outage probability (OP) and the bit error rate (BER) of the system for different numbers of relay and antenna cases are examined in Rayleigh fading channel via Monte Carlo simulations.Dept Comp Engn & Elect & Elect Engn, Elect & Elect Engn, Bilkent Uni